/* * This file is part of the Trezor project, https://trezor.io/ * * Copyright (C) 2019 Pavol Rusnak <stick@satoshilabs.com> * * This library is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, see <http://www.gnu.org/licenses/>. */ #include "otp.h" #include <libopencm3/stm32/flash.h> #define FLASH_OTP_BASE 0x1FFF7800U #define FLASH_OTP_LOCK_BASE 0x1FFF7A00U bool flash_otp_is_locked(uint8_t block) { return 0x00 == *(volatile uint8_t *)(FLASH_OTP_LOCK_BASE + block); } bool flash_otp_lock(uint8_t block) { if (block >= FLASH_OTP_NUM_BLOCKS) { return false; } flash_unlock(); flash_program_byte(FLASH_OTP_LOCK_BASE + block, 0x00); flash_lock(); return true; } bool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data, uint8_t datalen) { if (block >= FLASH_OTP_NUM_BLOCKS || offset + datalen > FLASH_OTP_BLOCK_SIZE) { return false; } for (uint8_t i = 0; i < datalen; i++) { data[i] = *(volatile uint8_t *)(FLASH_OTP_BASE + block * FLASH_OTP_BLOCK_SIZE + offset + i); } return true; } bool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data, uint8_t datalen) { if (block >= FLASH_OTP_NUM_BLOCKS || offset + datalen > FLASH_OTP_BLOCK_SIZE) { return false; } flash_unlock(); for (uint8_t i = 0; i < datalen; i++) { uint32_t address = FLASH_OTP_BASE + block * FLASH_OTP_BLOCK_SIZE + offset + i; flash_program_byte(address, data[i]); } flash_lock(); return true; }